<div class="header">
    <nav class="navbar navbar-default" role="navigation">
        <div class="container-fluid">
            <div class="navbar-header">
                <a class="navbar-brand" href="#">PHP原生后台</a>
            </div>
            <div>
                <!--向左对齐-->
                <ul class="nav navbar-nav navbar-left">
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                            PHP
                            <b class="caret"></b>
                        </a>
                        <ul class="dropdown-menu">
                            <li><a href="#">jmeter</a></li>
                            <li><a href="#">EJB</a></li>
                            <li><a href="#">Jasper Report</a></li>
                            <li class="divider"></li>
                            <li><a href="#">分离的链接</a></li>
                            <li class="divider"></li>
                            <li><a href="#">另一个分离的链接</a></li>
                        </ul>
                    </li>
                </ul>
                <!--                <form class="navbar-form navbar-left" role="search">-->
                <!--                    <button type="submit" class="btn btn-default">-->
                <!--                        向左对齐-提交按钮-->
                <!--                    </button>-->
                <!--                </form>-->
                <!--                <p class="navbar-text navbar-left">向左对齐-文本</p>-->
                <!--向右对齐-->
                <ul class="nav navbar-nav navbar-right">
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                            <?php echo $_SESSION['loginInfo']['username']?> <b class="caret"></b>
                        </a>
                        <ul class="dropdown-menu">
                            <li><a href="#">jmeter</a></li>
                            <li><a href="#">EJB</a></li>
                            <li><a href="#">Jasper Report</a></li>
                            <li class="divider"></li>
                            <li><a href="#">分离的链接</a></li>
                            <li class="divider"></li>
                            <li><a href="#">另一个分离的链接</a></li>
                        </ul>
                    </li>
                </ul>
                <form class="navbar-form navbar-right" role="search">
                    <button type="submit" class="btn btn-default">
                        向右对齐-提交按钮
                    </button>
                </form>
                <p class="navbar-text navbar-right"></p>
            </div>
        </div>
    </nav>
</div>